本文给大家介绍一个不错的需要登录的php 文件上传管理系统，功能简单有需要了解的同学可参考。
代码如下
<?php$admin_pw="admin";//管理密码$uploaddir="upload";//上传目录session_start();if($_GET['action']=="getcode"){ setcode(); exit();}if($_POST['password']==$admin_pw && $_POST['yz']==$_SESSION['yzcode']){ $_SESSION['logined']=$admin_pw;}if($_GET['action']=="logout"){ $_SESSION['logined']=""; header("location: ".$_SERVER['PHP_SELF']); exit();}if($_SESSION['logined']!=$admin_pw){?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>请登录</title></head><body><form action="" method="post">输入密码：<input type="password" name="password" /><br />验证字符：<input type="text" name="yz" /><a href="#" onclick="document.tzm.src='?action=getcode';"><img src="?action=getcode" alt="验证码" name="tzm" /></a><br /><input type="submit" value="进入管理" /></form></body></html><?php}else{?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>文件上传</title></head><body><?php if($_POST['ac']=="upload") { $fileall=explode('.',$_FILES['file']['name']); $filetype=$fileall[count($fileall)-1]; $filename=$uploaddir."/".$_FILES['file']['name']."_".rand(1,999999999).".".$filetype; $fileexists=file_exists($filename); while($fileexists==true) { $filename=$uploaddir."/".$_FILES['file']['name']."_".rand(1,999999999).".".$filetype; $fileexists=file_exists($filename); } if(move_uploaded_file($_FILES["file"]["tmp_name"],$filename)) { $url="http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI']; echo "文件:".$filename." 上传成功！<br>文件地址：<input type=text value=".dirname($url)."/".$filename." /><a href=".dirname($url)."/".$filename." target="_blank">测试</a>"; } else { echo "文件".$filename."上传失败！"; } }?><form action="" method="post" enctype="multipart/form-data">选择文件：<input type="file" name="file" width="100px" /><input type="hidden" name="ac" value="upload" /><input type="submit" value="上传" /></form><p><a href="?action=logout">退出登录</a></p></body></html><?php}function setcode(){ Header("Content-type: image/gif"); $border = 0; //是否要边框 1要:0不要 $how = 4; //验证码位数 $w = $how*15; //图片宽度 $h = 20; //图片高度 $fontsize = 5; //字体大小 $alpha = "abcdefghijkmnopqrstuvwxyz"; //验证码内容1:字母 $number = "0123456789"; //验证码内容2:数字 $randcode = ""; //验证码字符串初始化 srand((double)microtime()*1000000); //初始化随机数种子 $im = ImageCreate($w, $h); //创建验证图片 $bgcolor = ImageColorAllocate($im, 255, 255, 255); //设置背景颜色 ImageFill($im, 0, 0, $bgcolor); //填充背景色 if($border) { $black = ImageColorAllocate($im, 0, 0, 0); //设置边框颜色 ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//绘制边框 } for($i=0; $i<$how; $i++) { $alpha_or_number = mt_rand(0, 1); //字母还是数字 $str = $alpha_or_number ? $alpha : $number; $which = mt_rand(0, strlen($str)-1); //取哪个字符 $code = substr($str, $which, 1); //取字符 $j = !$i ? 4 : $j+15; //绘字符位置 $color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字符随即颜色 ImageChar($im, $fontsize, $j, 3, $code, $color3); //绘字符 $randcode .= $code; //逐位加入验证码字符串 } $_SESSION['yzcode'] = $randcode; Imagegif($im); ImageDestroy($im);}?>
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